I really like Chiara. It's pretty and unexpected yet I know how to pronounce it without looking it up I really like ChiaraAuroraJeannette, but agree that it is a bit difficult to pronounce. I don't see why you can't use "Isabelle" to honour an "Isabella" -I'm sure she would understand that the -a got switched to an -e for flow purposes. It's not that much of a stretch. NadiaIsabelleJeannette is quite pretty as is ChiaraJeannetteIsabelle/a.